Furnace-grate



(No Model.) 2 Sheets-Sheet 1.

J. THURELL. FURNACE GRA B.

No. 487,648. Patented Dec. 6, 1892.

QM azu/i v (NO Model.)

2 Sheets-Sheep 2. J. TH'URELL. FURNAGE 'GRATB. No. 487,648.

Patented Dec. 6 1892.

- UNITED STATES PATENT OFFICE.

JOHN THURELL, OF NORTH ADAMS, ASSIGNOR OF ONE-HALF TO JAMES B. KEANY, OFMILFORD, MASSACHUSETTS.

FU RNACE-G RATE.

SPECIFICATION forming part of Letters Patent No. 487,648, dated December6, 1892. Application filed April 30, 1892. Serial No.431,352. (Nomodel.)

T0 at whom it may concern:

Be it known that 1, JOHN THURELL. a citizen of. the United States,residing at North Adams, in the county of Berkshire and State ofMassachusetts, have invented new and useful Improvements inFurnace-Grates,of which the following is a specification.

My invention relates to furnace-grates of the same general type as thatshown and described in the Letters Patent granted to me upon the 29thday of September, 1891, No. 460,408.

It is the purpose of my present invention to provide a grate-frame ofnovel construction suitable for stoves and for steam-boiler furnaces inwhich overheating and warping of said frame shall be avoided, andwhereby, also, the grate shall be capable of manufacture at a low costand maybe repaired with great ease and economy, the parts being all madein duplicate and the construction being so simple that any person canreplace one or more injured or broken portions with new parts with greatfacility and with the minimum of time and labor.

It is a further purpose of my invention to provide a grate suitable forstoves and steamboiler furnaces, both stationary and locomotive, whichshall be dumped and shaken by the same novel devices, which shall becharacterized by the resulting economy of fuel, cleanliness ofoperation, quick and complete combustion,increased coal-supporting areaor grate-surface, and simplicity and ease of operation.

The invention consists, to these ends, in the several novel features ofconstruction and new combinations of parts hereinafter fully described,and then particularly pointed out and defined in the claims concludingthis specification.

To enable others skilled in the art to understand and to make,construct, and use my said invention, I will proceed to describe thesame in detail, reference being had for such purpose to the accompanyingdrawings, in which- I Figure 1 is a plan view of a grate embodying myinvention, having a form suitable for use in a stove or range. Fig. 2 isa plan view of the same grate as it appears in a steamboiler furnace.Fig. 3 is a longitudinal vertical section of the parts shown in Fig. 1,partly in elevation. Fig. 4 is a sectional view of part of the devicesshown in Fig. 2. Fig. 5 is a detail cross-section showing theconstruction of the shaking and dumping devices illustrated in Fig. 1.Fig. 6 is a detail end elevation of one of the grate-frames shown inFig. 2. Fig. 7 is a detail view of the end bars and the lower part ofthe side bars of the grateframe, showing their formation in a singlepiece. Fig. 8 is a detail view of the upper part or. complementarysection of one of the side bars; and Fig. 9 is a detail horizontalsectional view, on a small scale, of a portion of the grate-frame shownby Fig. 7.

In the said drawings, the reference-numeral 1 indicates the glate frame,which is usually rectangular and oblong, though it may be constructed ofany form required or preferred. I form this frame in three pieces, theend bars 2 and the lower longitudinal portions or sections 3 of the sidebars being cast in a single piece. These portions 3 of the side bars maybe about half the depth of the end bars, or they may exceed or fallshort of this width, as circumstances may require. Preferably, Iincrease their width somewhat from the ends toward the middle portion,to give additional strength and stiffness. In their upper edges,

at proper intervals, are formed seats or bearings at for thejournal-supports of the gratebars, said seats being less-than halfround, or comprising an area of somewhat less than one hundred andeightydegrees. The frame is completed by the separately-formedcomplementary sections or upper portions 5 of the side bars, which areof such length that their ends will enter mortises or channels 6 in theinner faces of the end bars, said mortises or channels being so locatedthat the complementary or upper portions 5 of the side bars when inplace will be substantially flush on both faces with the correspondingfaces of the lower portions or sections 3, while their ends and upperedges will be flush with the edges of the end bars. In the lower edgesof the separately-formed sections or complementary portions 5 are formedthecomplementary portions 7 of the seats or bearings 4 for the ends orjournals of the grate-bars,

which are inserted before the upper complementary sections 5 arearranged in their places, where each one is fastened by a single bolt 8,inserted in a suitable aperture in the part 3. I may substitute for thisbolt any other equivalentform of fastening device. I may cast the boltor other fastening integral with the upper sections 5; or I maycountersink the upper edges of said sections to receive the bolt-heads;or I may adopt any other preferred construction suitable for thispurpose. V

The bars of the grate consist, preferably, of rectangular parts 10,provided with journals 12 at their ends, which are of such length thattheir extremities project beyond the outer faces of the side bars.

Upon the upper edges of the grate-bars are form ed or mountedtheclinker-plates 13,which project alternately upon opposite sides ofeach bar and break joints with the clinker-plates upon the adjacentshafts. Upon the extremities of the journals of the grate-bars, whichproject outside the side bars, are formed 01' mounted clinker-plates 14,those upon one side of the grate extending from one side of the bar andthose upon the other side proecting in an opposite direction in order toequalize the weight. Upon the grate-bars lying atthe ends of the gratetwoof theclinker-plates are cut off to avoid colliding with the endbars, and the other two project unequally upon opposite sides of thebar, in order to properly fill the space between the grate-bar and theend bar of the frame. The alternation of the exterior clinker-plates 14enables me to compensate the inequality of weight thus produced and atthe same time to properly fill the space between the side bars and thewalls of the fire-box by mounting on one of the journals a plate 15,which projects about equally on both sides of the grate-bar axis, whileupon the other journal is mounted or formed aclinker-plate 16, whichprojects upon the same side with the shorter clinker-plate 17. The samearrangement is alternated at the other end of the grateframe, owing tothe odd numberof the gratebars. Should their number be even instead ofodd, the alternation will be unnecessary, the construction in otherrespects being the same.

The grate-bars are laid in place with their journals in the seats 4before the upper complementary sections or portions 5 of the side barsare set in place. The construction is such that when their ends areplaced in the mortises 6 and the bolts or fastenings 8 are adjustedthere will remain an open space 18 between the lower and upper sectionsof the side bars, which will atford ample draft-passages. The current ofair flowing through these spaces 18 will maintain the low temperature ofthe sections 3 of the side bars, and thereby wholly avoid the warping ofthe frame.

From the lower edges of the grate-bars are dropped lugs 19, having studsprojecting horizontally to engage apertures in a bar 21. At one end thisbar is connected to an arm 22, which forms partof abar 23. In the formof grate shown in Fig. 1 this bar 23 enters the fire-box by alongitudinal slot in the end journal 24:, by which the grate issupported, said journal being placed a little upon one side of thecentral line of the grate, in order that gravity shall normally preserve1t in horizontal position, its heavier side belng supported by smallbrackets 25 on the wall of the fire-box. The bar 23 is movablelongitudinally in the slot in the journal 24, and its outer end isprovided with a cross-head 26 or any suitable form of lever, whereby arocking movement may be given to the gratebars, or a rotary motionimparted to the entire frame, turning it upon its end ournals 23, thegrate being thus shaken and dumped by the same device.

In the form of grate shown in Figs. 2 and t the construction adopted isessentially similar, the only variation consisting in pivoting the endof the bar 21 to a lever 27, having a pivotal fulcrum 28 upon the. curlbar of the grate-frame. This lever is provided with a socket -piece 29,having an angular socket adapted to receive a lever 30 of suitable form,whereby the lever 27 may be vibrated upon its fulcrum 28 to shake thegrate, and whereby, also, a rotary movement may be given to turn thegrate-frame on its end journals and dump the grate. In all otherrespects the construction of the parts shown in Figs. 2 and 4 issubstantially identical with that seen 1n Figs. 1 and 3.

What I claim is- 1. In a fire-grate, a grate-frame composed of end bars2 and lower side-bar sections 3, cast integral with the end bars, andseparate side bar sections 5, located above and connected with the saidlower side-bar sections, substantially as and for the purposesdescribed.

2. In afire-grate, a grate-frame composedof end bars cast in singlepiece with longitudinal lower portions of the side bars andcoinplementary sections or portions of the said side bars formedseparately, the end bars of the frame being provided with mortises orchannels to receive the ends of the complementary sections and theadjacent edges of the upper and lower sections being provided with seatsor bearings for the journals of the grate-bars, substantially asdescribed.

3. A grate-frame for stoves and furnaces, consisting of end bars cast inone piece with lower longitudinal portions or sections of the side bars,separately formed complementary sections or portions of said side barsof somewhat greater length than the integral sections, their ends beingreceived in mortises or channels in the inner faces of the end bars, andgrate-bars having journals lying in seats or bearings between the lowerand the complementary upper sections of the side bars, a

space being provided between said upper and lower sections for thepassage of air, substantially as described.

4. In a grate for stoves and furnaces, the combination, with the lowersections or portions of a grate-frame cast integral with the end barsand having seats 01' bearings, of gratebars having journal-supportslying in said seats and complementary upper sections or portions of theside bars having their ends lying in mortises or channels in the endbars and their edges resting upon the journals of the grate-bars, saidcomplementary sections or portions of the side bars being separated fromthe integral sections, to which they are connected by a centralfastening, substantially as described.

5. In a fire-grate, the combination, with a rocking grate-frame havingend journals, of

Witnesses:

EDWARD GUILBR, MARK E. CoUcH, CHARLES KEANEY.

